(Also it is) they who said: "God made covenant with us, that we believe not in any Messenger unless he brings us an offering which (as a sign of its being accepted by God) a fire (from heaven) will consume." Say (to them, O Messenger): "Before me there came to you Messengers with the clear proofs (of their Messengership) and with that (same miracle) which you describe: why, then, did you kill them, if you are true in your claim?"